Siemens Healthineers AG snagged a key role in the mystery playing out across the world's pandemic stage – what do antibody test results mean in terms of immunity to SARS-CoV-2 and how do different tests assessing different proteins compare? The U.S. CDC and the Joint Research Centre (JRC) of the European Commission tapped the Erlanger, Germany-based company to take the lead in developing a process to standardize antibody assays.